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Pervasive Data Access (PDA) Research Group. Mei Li Pennsylvania State University. Overview. Investigate various research issues involving data access and management in a wide spectrum of pervasive/mobile computing and networking environments peer-to-peer networks mobile ad-hoc networks

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pervasive data access pda research group

Pervasive Data Access (PDA) Research Group

Mei Li

Pennsylvania State University

overview
Overview
  • Investigate various research issues involving data access and management in a wide spectrum of pervasive/mobile computing and networking environments
    • peer-to-peer networks
    • mobile ad-hoc networks
    • wireless sensor networks
  • Also investigate object-oriented databases, XML, security, and information integration and retrieval

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peer to peer p2p systems
Peer-to-Peer (P2P) Systems
  • Peer-to-Peer computing paradigm has changed the ways large-scale distributed systems are built and operated.
  • Goal of our research
    • design data management systems to support various applications ranging from distributed research locating to network attack detection
  • We Investigate
    • Information management infrastructure
    • Complex queries processing
    • Knowledge discovery (clustering, outlier detection)
  • We address various system issues
    • overlay maintenance, load balancing, resilient to dynamic changes, adaptivity to query locality

3

location aware wireless sensor networks wsns
Location-aware Wireless Sensor Networks (WSNs)
  • WSNs have a wide range of applications
    • object tracking, environmental monitoring, warehouse inventory, and health care.
  • Goal of our research
    • build data management systems in support of data collection, aggregation, dissemination, in-network query processing and query optimization.
  • We investigate
    • location tracking of moving objects
    • location-based routing
    • complex query processing (window, KNN, and aggregation queries)
    • Spatio-temporal modeling and estimation of wireless link quality in sensor networks

4

mobile and pervasive data access
Mobile and Pervasive Data Access
  • Important for a wide range of mobile businesses and applications.
  • We are one of the first few pioneers who started research in this area
    • Indexing
    • Caching
    • Accessing
    • Data aggregation
    • Data dissemination
    • Channel allocation
    • Query processing
  • Our work has extensive coverage
    • from simple data to spatial data
    • from single cell to multiple cells
    • from stationery clients to moving clients

5

location based services lbss
Location-Based Services (LBSs)
  • LBS is one of the killer applications for mobile computing and wireless data services.
  • We investigate
    • indexing and caching spatial data to support the processing of location based spatial queries (LBSQs)
      • point query, window query, k nearest neighbor (KNN) search, continuous nearest neighbor (CNN) search, spatial join, and other complex spatial queries
  • We address various issues
    • large index search space, large index size, linear streaming property of wireless data broadcast, continuous movement and requests of mobile users, and cache replacement/invalidation

6

contact information
Contact Information
  • Dr. Wang-Chien Lee
  • E-Mail: wlee@cse.psu.edu
  • http://www.cse.psu.edu/~wlee/pda/
  • Mei Li
  • E-Mail: meli@cse.psu.edu
  • http://www.cse.psu.edu/~meli

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